RFR: 8129426: aarch64: add support for PopCount in C2
edward.nevill at gmail.com
Mon Jun 22 13:23:21 UTC 2015
Aarch64 currently does not support the PopCountI and PopCountL nodes in aarch64.ad
The following webrev adds support for these using the SIMD instructions 'cnt' and 'addv'
This patch was contributed by alexander.alexeev at caviumnetworks.com
The patch only modifies aarch64 specific files.
I have merged the patch in and tested it with JTreg / hotspot with the following results.
Original: Test results: passed: 847; failed: 13; error: 6
Revised: Test results: passed: 848; failed: 12; error: 6
The single additional failure in the original is the test
which is an intermittent failure in the original.
I have benchmarked the patch on four different partner platforms. The average improvement was 2.6X for PopCountI and 2.5X for PopCountL.
Please review and if OK I will push,
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